Bocek today tweeted the news and stated Wiman suffered a knee injury. MMAjunkie.com (www.mmajunkie.com) could not immediately confirm details of the injury.

UFC 145 takes place April 21 at Atlanta’s Phillips Arena. The main card airs on pay-per-view, and FX and Facebook carry the prelims.

Wiman vs. Bocek was slated for the PPV portion of the card, though it’s not clear if it’ll retain its main-card slot with the change.

Alessio looks for his first UFC win in his fourth stint with the organization. Over the years, he suffered losses to Pat Miletich (2000), Diego Sanchez (2006) and Thiago Alves (2006) under the UFC radar. Recently, though, the 32-year-old Canadian has been on a roll with 10 victories in his past 11 fights. The lone loss came to Siyar Bahadurzada, who later signed with the UFC. Alessio’s wins have come over the likes of Luigi Fioravanti, War Machine and Ryan Healy.

In his most recent performance at UFC 140, Bocek soundly outpointed Nik Lentz, who until that point had technically never lost inside the octagon (a submission defeat to Charles Oliveira at UFC on Versus 4 was overturned due to an illegal knee). Still, Bocek could use some momentum. Although he has racked up six wins in the octagon, he has fallen short against top-tier competition such as now-champ Ben Henderson (at UFC 129), Jim Miller (UFC 111) and ex-champ Frankie Edgar (at UFC 73).

As the UFC 189 tour made its last stop in Dublin, featherweight champ Jose Aldo was met with a torrent of abuse from the Irish fans. It might have been unpleasant, but it might also have been just what he needed.